I contacted the EV West people (California) a few years back.? They sent a list of the components they think would do the job (no labour cost included of course)... it came to $15k including 30 kWh batteries if memory serves.? The way the world is going, I think this route is making more and more sense.
When you consider the number of Willys/Scout vehicles out there that use the D18/D20 transfer case, a kit of $15-20k would probably sell very well.
